The effect of stress multiaxiality on void nucleation and growth at ductile fracture

0385814 - ÚFM 2013 RIV SK eng A - Abstract
Stratil, Luděk - Hadraba, Hynek - Dlouhý, Ivo
The effect of stress multiaxiality on void nucleation and growth at ductile fracture.
Fraktografia 2012. Košice: Institute of Materials Research of the Slovak Academy of Sciences in Košice, 2012 - (Ballóková, B.; Hvizdoš, P.). s. 38-38. ISBN 978-80-970964-2-7.
[Fraktografia 2012. 21.10.2012-24.10.2012, Stará Lesná]
R&D Projects: GA ČR(CZ) GAP108/10/0466
Grant - others:GA MŠk(CZ) FSI-J-12-27
Institutional support: RVO:68081723
Keywords : stress multiaxiality * void growth * void nucleation * GTN model * Eurofer97
Subject RIV: JG - Metallurgy

In this study the effect of various stress multiaxiality was investigated for Eurofer97 steel in fully plastic regime. The tests of smooth and notched round tensile bars were performed. The fracture surfaces and the area beneath the fracure surfaces of tested specimens were fractographycally and metallographycally analysed to quantify the fractions and the shape of the voids. The incresing multiaxiality in the specimen's centre increases the stress characteristics and decrease of deformation characteristics of the test. In the same manner the void nucleation process is restricted contrary to void growth process which is promoted. The results of analyses will be used for calibration of the parameters of the Gurson-Tvergaard-Needleman model.
Permanent Link: http://hdl.handle.net/11104/0215254